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Valve Torque: Before the actuator can be sized for any given valve application, the operating torque required for the valve must be determined. The oper ating torque of the ball valve is influenced by a number of factors— some are design and materialsrelated, others are application (ser .
Thrust washers Bearing retainer pin Seat injection fitting Stud Nut Adapter plate Capscrew Stem bearing Stem seal Orings Thrust washer Stem Stem key Drive pin Ball Stem bearing ... Ball Valve Torque Chart Size in, [mm] Gauge Pressure, psi Torque Expressions, Break Torque, Run Torque, Reseat Torque,
Ball Flow‑Tek valves offer a precision machined, solid, stainless steel ball that is polished to a surface finish of 8 Ra or better for bubble‑tight shut off and reduced operating torque. The critical ball edge has blended curvatures to reduce seat wear and provide a high cycle life. As an add‑ ed safety feature, a .
Calculation of final valve torque (FBTO) for selection of gearbox or actuator Calculated final valve torque (FBTO) based on temperature and seat material: SEAT MATERIAL AT VARIOUS TEMPERATURE FINAL VALVE TORQUE (FBTO) "MODIFIED PTFE / RTFE" / Devlon from () 29 °C to high temperature as per PT rating chart = BTO (Refer to Table A)
Apr 10, 2019· Maximum allowable stem torque/thrust (MAST) is dened as the maximum torque/thrust that can be applied to the valve train without risk of damage, as dened by the valve manufacturer/supplier. The...
(1) Seating Torque The torque required to displace a resilient seat and effect shutoff. (2) Bearing Torque The torque required to overcome friction forces on the valve shaft bearing surfaces (3) Dynamic Torque Torque due to fluid forces which tend to close the valve. The torques for resilient seated valves tabulated in this section are ...
Ball Flow‑Tek valves offer a precision machined, solid, stainless steel ball that is polished to a surface finish of 8 Ra or better for bubble‑tight shut off and reduced operating torque. The critical ball edge has blended curvatures to reduce seat wear and provide a high cycle life.
valves the output shaft shall be hollow to accept a rising stem, and incorporate thrust bearings of the ball or roller type at the base of the actuator. The design should be such as to permit the opening of the gearcase for inspection or disassembled without releasing the stem thrust or taking the valve .
Maximum allowable stem torque/thrust (MAST) is defined as the maximum torque/thrust that can be applied to the valve train without risk of damage, as defined by the valve manufacturer/supplier.
VALVE/ ACTUATOR TORQUE SIZING ANALYSIS CHART FOR TRUNNION BALL VALVES ... For Devlon/ Nylon Seat the valve torque is higher and PEEK is even higher (of course we have factored into torque of valve where applicable), however as these are harder materials (especially PEEK) infrequent use has a lesser effect on the increase ...
3. b. SEAT HYDROSTATIC TESTING TIME RANGE TIME DN 1/2" to DN 4" 2 minutes DN 6" to DN 18" 5 minutes Over 20" 10 minutes 4. a. SEAT PNEUMATIC TEST PRESSURE All ratings and DN 6 bar 4. b. SEAT PNEUMATIC TESTING TIME Same times as in Section PRESSURE FUNCTIONAL TESTING API 6D BALL VALVES
860 1 Trunnion Thrust Disc Notes 1. Seat Inserts are only available for soft seat valves. Metal seated valve seats are coated with Tungsten Carbide. 2. Are only used on gear operated valves. Lever operated valves do not require a key. 3. On smaller twopiece trunnion and nontrunnion mounted valves coil springs are not used. 4.
You get valve torques and you get actuator torques. they often come in the form of a maximum torque that can be applied to the stem before damage will occur and also operating torques. so ball valve will often have a MAST (max allowabe stem torque) and also BTO (Break to Open) torque required to intiate opening, RTO (Run to Open) the torque required to complete the majotity of the .
Dynamic Torque Dynamic torque is torque on the valve shaft due to the fluid forces on the valve disc. This torque is a function of valve diameter, pressure drop, Torque is calculated by the equation:
slots are a unique feature of LT Ball Valves. The slots relieve upstream pressure when the valve is in closed position and prevent seat damage. Actuator Mounting Flange LT singlepiece and twopiece Ball Valves are provided with an integral actuator mounting flange conforming to ISO 5211. Please note that full bore valves in sizes DN 15 to DN 25
valves comprise a single part. The ball and the shaft are separate parts and a shaft blowout is prevented by a separate thrust ring/pin and retaining plates. A spline driver transmitting the shaft torque to the ball connects the shaft with the ball. In 1" and 1 1/2" valves the shaft directly drives the slot in the ball (no separate driver).
b) Ball valve with solid circular stem rectangular crosssection at the end of stem for connection to ball(Type B) (Valve / Actuator mounting bracket design ISO 5211 and stress calculation Not covered in this presentation). c) This guide is applicable to trunnion mounted ball valves only. d) This guide is limited to maximum allowed torque ...
operating torque • Factory positioned external stops • Stem separate from the ball, antiblowout design. Side load on stem • Plastic polymer insert for seat sealing • Self Relieving seats for ASME Classes 150, 300 • Metalbacked self lubricating PTFE sleeve bearing and thrust washers reduce torque .
Subsea Ball Valve, 2Way, Soft Seat Ordering Information Page 10 Subsea Needle Valve, ... Breakout Torque is the torque needed to initially rotate valve when in closed position with full MAWP on one side and 0 psi on the other. ... 10 Thrust Bush (Top) 316 Stainless Steel 316 Stainless Steel 316 Stainless Steel 316 Stainless Steel ...
FlowTek''s F15/F30 Flanged Series ball valves feature a floating ball design for low torque and increased cycle life. As standard, large size valves feature trunniontype ball support. These rugged ball valves are ideal for industrial applications. Body2 Piece
Seats Body Seals Stem Packing Thrust Washer Flanged End 3 Piece C Valves Valve Soft Parts FloTite ball valves are available with a variety of seat seal options to allow use in a wide range of general as well as special services. The softseated ball valves are factory tested for .
A highly flexible lip, which assures full circle contact between the seat and disc when the valve is closed, is incorporated in the design. The lip flexibility permits breakout torque for the metal seat is the same or less than soft seat breakout torque. ANSI class IV shutoff is achieved through DiskFlo metal seats.
The ball assembly shall be supported by a twoway thrust bearing assembly consisting of a stainless steel stud and thrust collar in a greasepacked cavity. Valve Seats – Rubber All seats shall be of a synthetic rubber compound.
2 KTM ViRgo SERiES S FloaTing ball ValVES ToRquE Cast floating ball valves from nPs ½ to 10 (2004 Design) Legends SS Soft seated standard floater SA Soft seated standard with gland packing floater SO Soft seated oil patch floater ST Soft seated threaded / socket weld floater Pressure class Seat Torque values (BTO) Nm (lbf·in) NPS ¾ x ½ NPS 1 x ¾ NPS 1½ x 1 NPS 2 x 1½ NPS 3 x 2 NPS 3 x ...
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